Provided is a treatment solution for a chromium-free tensile stress coating film, which can be prepared using an inexpensive Ti source without requiring the use of an expensive Ti chelate, and can simultaneously achieve both excellent hygroscopicity resistance and a high iron loss-reducing effect that is produced as a result of being imparted with high tension. A treatment solution for a chromium-free tensile stress coating film, which comprises at least one phosphoric acid salt selected from phosphorus acid salts of Mg, Ca, Ba, Sr, Zn, Al, and Mn, colloidal silica in an amount of 50 to 120 parts by mass in terms of SiO2 solid content relative to 100 parts by mass of the phosphoric acid salt, a Ti source in an amount of 30 to 50 parts by mass in terms of TiO2 content relative to 100 parts by mass of the phosphoric acid salt, and H3PO4, wherein the number of moles of a metal element in the phosphoric acid salt and the number of moles of phosphorus in the treatment solution satisfy the relationship represented by formula (1).(1) 0.20 ≤ ([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P] ≤ 0.45
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